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subnet mask 240 creates 14 subnets

By northwood ·
When subnettinga a class C IP address, adding a 240 subnett masks use to result in 14 subnet IDs. Now I hear that the subnet mask of 240 creates 16 subnet IDs. Is this true? If so, then why can 240 create up to 16 subnets instead of 14? Has the version of IP changed from version 4 to version 5?

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by Joseph Moore In reply to subnet mask 240 creates ...

http://www.learntosubnet.com/
Go there for all subnet explanations.
And, there isn't a v5 of IP yet.
Sure, there's IPv6, but that's not what you're dealing with either.

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by northwood In reply to subnet mask 240 creates ...

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hi northwood

by bencheart18 In reply to subnet mask 240 creates ...

240 creates 16 subnets IDs. It's true.

since the SM 240 is in 3rd octet, which is 20 bits from the leftmost or known as /20.


we have formula:


/20
/\
21 21 2 subnets
/\ /\
22 22 22 22 4 subnets
/\ /\ /\ /\
2323 2323 2323 2323 8 subnets
/\ /\ /\/\ /\ /\ /\ /\
2424 24 2424 2424.. .. .. 16 subnets

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